OpenKnowledge released a WYSIWYG markdown editor that runs as a native macOS app or a CLI‑served web UI. The tool embeds direct integrations with Claude, Codex and Cursor, letting LLM agents edit side‑by‑side inside the editor. It targets teams that want Google‑Docs‑style markdown collaboration without cloud lock‑in.

The stack mixes Tiptap/ProseMirror for rich‑text, CodeMirror for code blocks, and Yjs CRDT to sync ProseMirror and raw markdown bidirectionally. A dual‑observer pipeline preserves byte‑level fidelity when converting between AST and markdown. Git and GitHub power version history, undo/redo and a no‑code sharing layer that keeps data private.

OpenKnowledge ships under GPL-3.0‑or‑later, inviting community contributions via a public GitHub repo. Linux and Intel‑Mac users can run the editor locally with Node 24+, while Windows is unsupported. The project already offers built‑in MCPs, skills and RAG templates for LLM wikis and “AI second brain” use cases, delivering a private, extensible markdown workspace.

Early adopters praise the seamless side‑by‑side AI editing and the git‑backed collaboration view, which shows which agent modified which line. Because all data stays on the local file system, teams can enforce strict confidentiality while still benefiting from real‑time LLM assistance. The codebase is ready for plugins, hinting at a growing ecosystem.